import java.util.ArrayList;
import java.util.List;

public class Demo12 {
    private static int count=0;
    private static Object locker1= new Object();
    private static Object locker2= new Object();

    private static String s = "hello";
    private static List<String> list = new ArrayList<>();

    private static int a = 10;

    public static void main(String[] args) throws InterruptedException {
        Thread t1 = new Thread(()->{
            for (int i = 0; i < 50000; i++) {
               synchronized(Demo12.class){
                   count++;
               }
            }
        });

        Thread t2 = new Thread(()->{
            for (int i = 0; i < 50000; i++) {
                synchronized(Demo12.class){
                    count++;
                }
            }
        });

        t1.start();
        t2.start();

        t1.join();
        t2.join();

        System.out.println("count="+ count);
    }
}
